Hack-sawing machine.



PATENTED SEPT. 6, 1904.

' H. A. E. LIEBERT.

HACK SAWING MACHINE. APIPLIUATION FILED JUNEQ, 19 03.

3 SHEETS- SHEET 1.

N0 MODEL.

a? fn'veji for By 02- Wtnes ses z. JttaJrne-y PATENTED SEPT. 6, 1904. H. A. E. LIEBERT. HAOK SAWING MACHINE.

APPLIGATION FILED JUNE 9, 1903.

3 SHEETSSHEET 2.

N0 MODEL.

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PATENTED SEPT. 6, 1904.

H. A; EILIEBERT. HAOK' SAWING' MACHINE.

APPLIOATION FILED JUNE 9, 1903.

s SHEETS-SHEET a.

N0 MODEL.

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UNITED I STATES Patented September 6, 1904.

PATENT OFFICE.

HACK-SAWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 769,265, dated September Application filed June 9 1903. Serial No. 160,770. (N0 model.)

To all whom it may concern: I Be it known that I, HENRY ANTON EMIL LIEBERT, a subject of the King of Great Britain, residing at Milnrow, near Rochdale, in the county of Lancaster, Kingdom of Great Britain, have invented new and useful Improvements in Hack-Sawing Machines, of which the following is a specification.

My invention relates to improvements in and connected with hack-sawing and the like machines; and the object is chiefiyto provide means for automatically turning the work while the saw reciprocates, and thereby to cut through the work muchquicker and straighter, saving both time and material and increasing the life of the saw, the cuttings leaving the path of the saw more readily than hitherto has been the case.

I attain these objects by the mechanism illustrated in the accompanying three sheets of drawings, in which- I I,

Figure 1 is a side View, Fig. 2 a plan, and Figs. 3 and A, respectively, a front and a back end view of my improved machine. Figs. 5, 6, and 7 are details thereof at an enlarged scale. Figs. 8 and 11 are sectional side views, Fig. 9 a plan, and Figs. 10 and 12 cross-sections, of the driving end of the machine.

Similar letters refer to similar parts throughout the several views. 1

In carrying out my invention, and referring to Figs. 1, 2, 3, and 4, I employ upon a suit able bed a a vise Z), having two jaws c c to hold the work 0?; but instead of their faces being at a right angle to the bed they are formed to incline toward each other, so as to prevent the work rising, holding it just tight enough to revolve under friction. In connection with the said vise I employ a rod or bar d, the front end of which carries a gripping devicesay consisting of a loop a, guided in a slot f, formed in each jaw c and having a V-shaped bottom bearing against the work and at the top a bracket g, secured by means of the bolt h. The inner end or head of this bracket has a vertical slot 2', (see more particularly Figs. 5, 6, and 7,) in which are fulcrumed one or more pawls 74, each placed under the influence of a spring Z, which tends to press it against a pin m, and thus cau'sethe said pawls to grip the work when the loop 6 moves backward by abutting against the pin m and release the work when the loop 0 moves forward by the springs Zv allowing the same to recede from the pin m, and thereby slide over the work.

On each side of the said head a roller a is mounted upon a slide 0 and adapted to run upon the work, and thereby keep the said pawls in proper contact with the Work, and to compensate for the wear of the said pawls the said slides are rendered adjustable toward the circumference of the work by means of set-screws. In order to allow of accommodating the said pawls and rollers to thevarious thicknesses of work, the bracket 9 is rendered relatively adjustable upon the said loopsay by means of a screwed spindle p and two nuts 9 q. The other end of the rod orbar d has an upand-down movement imparted-through the medium of a bracket 1", (or other suitable means,) having an inclined slot 8 and secured upon and moving with the slide 2?, carrying the pillars a, upon which the sawframe o is mounted and fed in the usual man'- ner, the said end being furnished with an antifriction-roller w, engaging in the said slot. The slide 2f is reciprocated from the drivingshaft 4: by means of a crank-arm t and a rod t pivoted. to the latter and to a projection underneath the same. (See more particularly Figs. 9, l1, and 12.)

Each time the saw w operates the slotted bracket r lowers the respective end of the rod or bar d, and thereby causes the pawls 7a to be forced against the pin m, and thereby grip and turn the work a certain distance against the direction in which the saw cuts, while on the return movement of the saw the said rodor bar is raised bythe said bracket, and thereby the spring Z, yielding to the pressure of the said pawls,cause the latter to release the Work and riding over the Work return to their normal position.

In order to automatically stop the machine when a piece has been cut on", and thus prevent damage, the following device "is provided: To the side of the machine where the cut-off piece drops from the work a lever y is fulcrumed, having. loosely attached one arm of an angular lever a, passing through the bed of the machine, and the other arm supporting a lever 2, placed under the influence of a spring 3 and fulcrumed to the driving-shaft 4: of the machine. The fulcrum end of this lever has on its inner side projections 5 (see more particularly Figs. 8, 9, and 10) adapted to operate in conjunction with corresponding recesses 6 in the end of the driving-shaft hearing adjacent thereto, which projections while the machine is at work are positioned out of and at the side of the said recesses, and there by the driving-pulley 7 kept coupled up with the collar 8, secured upon the driving-shaft 4. The piece cut off the work drops upon the free end of the lever y and causes the latter to depress the long arm, and thereby withdraw the short arm of the lever .2 from under the lever 2. The spring 3 then pulling down the latter causes the said projections to engage in the said recesses and allows the spring 9 to expand, force the driving-pulley 7 inward, and thereby disconnect it from a collar 8, secured upon the shaft 4, and revolve loosely upon the latter, thus stopping the saw until such times as the lever 2 is placed upon the lever-arm 2 again and the driving-pulley 7 thereby connected with the said collar, when the saw begins to operate again.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a machine of the class described having a reciprocatory saw, the combination with the machine-bed of a pair of jaws having faces inclining toward each other to loosely hold and allow the work to rotate therein, means for intermittently gripping the circumference of and thereby intermittently rotate the work, all substantially as and for .the purpose set forth.

2. In a machine of the class described hav ing a reciprocatory saw, the combination with it, means pivoted in the top of the said yoke to engage the work in one direction only, a rod extending rearwardly from the said yoke and means for raising and lowering the rear end of the said rod, all combined substantially as and for the purpose set forth.

3, In a machine of the class described having a reciprocatory saw, the combination with themachine-bed of a pair of jaws having faces inclining toward each other to loosely hold and allow the work to rotate therein, a yoke around the work with bottom bearing against it, a rod extending rearwardly from the said yoke, means connected with the said reciprocatory saw to raise and lower the rear end of the said rod, a bracket in the top of the said yoke, feed-pawls pivoted on the inside and rollers on the outside of the lower end of the said bracket, the said bracket and rollers beingrendered independently adjustable in relation to the circumference of the work and the said pawls alternately engaging and releasing and thereby rotating the work in one direction only, all substantially as and for the purpose set forth.

4. In a machine of the class described having a work-holding device and a reciprocatory saw, means for stopping the machine when a piece has been cut off the work, comprising a drop-lever positioned in the path of the falling piece adapted to be actuated by the piece cut off, an angular lever attached to the said drop-lever, a spring-actuated cam-lever fulcrumed to the driving-shaft and supported by 

